Edge-covered board



'June 5, 1928. Y 1,672,099

1 J. SCHUMACHER EDGE COVERED BOARD Filed Nov. 10, 1925 IN V EN TOR.

A TTORNEYS.

to form joints between panels.

Patented June 5, 1928.

UNITED STATES,

JOHN SCHUMAGHER, 01 L05 ANGELES,'CALIFOBNIA.

EDGE-COVERED BOARD.

' Applidation filed November 10, 1925. Serial No. 68,209.

of the board. In Figs. 1 and 3', this edge This invention relates to aplaster board having an edge constructed so as to provide a marginalreinforcement and permit locking of adjacent panels at their joints.More specifically, this invention pertains to a board having a slottededge.

It is desirable to provide plaster board which has great resistance tobending at the edges, especially at the edges which are Anotherdesirable feature of such board is to provide means whereby adjoiningedges may be interlocked against bending and warping transverse to theplane of theboard at the joints. Moistening of the board at such jointsduring the process of covering with a finished coat of plaster, theinsertion of plaster cement at the joint and operating upon the boardduring installation often causes displacement and interruption of theface of the board at the joints producing an uneven stepped surface.This invention has for an object the provision of a. board which may belocked at adjoining edges and which is reinforced against warping orbending. Another object of this invention is the provision of a boardwhich may'be compressed at the edges to decrease the thickness andpermit the covering of the board at the joints with tape so that thesurface of the tape is flush with the surface of the wall produced bythe board.

These objects together with other objects and correspondingaccomplishments are obtained by means of the embodiment of my inventionillustrated in the accompanying drawing, in which:

Fig. 1 is a perspective view of a fragment of a board at the edgeshowing one form of my invention; Fig. 2 is a perspective view of afragment of a board embodying another form of the invention; Fig. 3 is atransverse section through adjacent boards secured to a. stud and havingthe joint covered by a tape; Fig. 4 is a transverse section throughadjoiningpanels showing them locked together against displacement by aplate; and

Fig. 5 is a perspective view of a plate for locking panels together; 0

Referring more particularly to Figs. 1

and 3, the ordinary plaster core of wall board is indicated by 6. Upperand lower 7 are bonded thereto in cover sheets of paper However, a slotof the usual manner.

- wedge shape and comparatively deep is aces formed in the edgeintermediate the the strip covering the edge.

and slot are shown covered with a strip of paper 8, which is bondedthereto. The cover sheets are of such length that the edges overhang thecore and are turned downwardly as indicated by 9 and 10 to overlap Thefinished product is aboard having its edge covered. The construction maybe varied so that instead of having an independent strip covering theedge, one of the cover sheets may be of such length that it may beturned over to cover the edge and the walls of the slot.

In Fig. 2, the plaster core is indicated by 16 and has bonded theretocover sheets of paper 17. A slot is formed in the edge of the board, andthe edge and walls of the slot are covered by a strip of paper 18. Thisstrip is shown abutting the base sheets. The strip 18 may be made withtransverse crimps 19 and 20. This will add strength to thereinforcement, serving as ,both a covering for the slot and areinforcement for the edge.

In Fig. 3, panels of plaster board of the character shown in Fig. 1 areillustrated nailed to a stud. The edges of the boardare butted and thenails driven through the slots. This causes compression of the edges sothat a depression is formed at the joints. This may be covered by astrip of tape 23 which has a bevelled face so as to produce a finalsurface which is flush, the joint between the board being effectivelysealed. It is obvious that plaster cement may be inserted in the joint,if so desired.

In Fig. at, two panels of plaster board of the character or type shownin Fig. 2 are illustrated interlocked with one another. In thisinstance, the joint may be between studs in a building structure andunsupported by any backing. In such positions where the panels are notlocked to one another, pressure upon one panel, may cause the latter tobend and make an interruption in the surface of the wall at the jointdue to disalignment of the board. My improved board may be locked toprovide. against this, and in the present instance strips of metal orother similar material indicated by 24 are placed in ad'oining slots. Aplain strip of metal may e employed, or, as in Fig. 5 a strip havingraised portion 26 so as to fill the slot and grip the walls thereof. Inthis instance, if it is desired, the joint may be covered with a pieceof tape 27, as in the structure shown in Fig. 3. HoWevemas/the edges arenot compressed, it will be found advisable in order to obtain smoothnessof the surface at the joints to sand paper or otherwise cut away theedges so that they are beveled and place the tape in position over thejoint.

It is obvious that the board disclosed herein may be used for otherpurposes. For illustration, plaster cement or the like inserted in thejoint between the edges of such board, will enter the latter and form akey; This cement when set will serve as a lock and a filler betweenjoints.

What I claim is:

1. A plaster board having a transversely i compressible edge providedwith a longitudinal kerf disposed intermediate the faces of the board,said kerf being formed by converging walls.

2. A plaster board having a transversely compressible edge provided witha longitudinal slot disposed intermediate the faces of said board, saidslot being formed by converging walls, and a strip of pliable materialbonded to the edge and extended into the slot so as to cover the wallsthereof.

3. A wall board comprising a core of cementitious material with coversheets bonded to the faces thereof and having a deep longitudinal slotwith converging walls in an edge thereof, said slot being disposedintermediate the faces of the board.

4. A wall board having a core of cementitious material with cover sheetsbonded to they faces thereof, an edge of said board having alongitudinal slot with converging walls disposed intermediate the facesofthe board, and a cover of pliable material bonded to the edge andextended into the slot so as to cover the walls thereof.

In witness that I claim the foregoing I have hereunto subscribed my namethis 28th day of October, 1925. v

.- JOHN SCHUMACHER.

